Across the United States, ecologists are battling to save endangered species from extinction. Scientists are now joining in the effort with sophisticated models that can be used to predict, and eventually prevent extinction. In this program, we travel to the Florida Everglades to see how the tiny Cape Sable Sparrow is faring despite an over-flooded environment, and to New England to find out how field mice are adapting after their habitat was destroyed. We discover what role scientific models play in the future of these species.